Malicious PDF — malware analysis report

Static analysis result for SHA-256 31f69b36725054b0…

MALICIOUS

PDF

90.2 KB Created: 2021-05-17 07:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 279c31274f8622fe6aaf97e726d0e147 SHA-1: 54e62374b741e3ff3b2a5df72e843b29e8567701 SHA-256: 31f69b36725054b07fbd759a891a16e777bd191945c8550f65664a052bb1320b
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/strik?utm_term=what+does+the+health+department+do+if+you+test+positive+for+covid+19 PDF link annotation
    • https://xiriwedonup.weebly.com/uploads/1/3/4/2/134265341/newedajumewixar.pdfIn PDF document text
    • https://cdn.sqhk.co/gafisasiwu/yiggh8X/knowledge_is_power_meme.pdfIn PDF document text
    • https://sijapuxojowul.weebly.com/uploads/1/3/4/6/134616399/8e886565679318e.pdfIn PDF document text
    • https://dolibaradodusop.weebly.com/uploads/1/3/4/5/134595809/bapufu.pdfIn PDF document text
    • http://zuxuvikewi.sportsontheweb.net/ragofila.pdfIn PDF document text
    • https://cdn.sqhk.co/futidiwe/jaZbKTq/battle_royale_simulator_roblox_all_codes.pdfIn PDF document text
    • http://jofifuneku.medianewsonline.com/arduino_lcd_library.pdfIn PDF document text
    • http://gufinatulo.iblogger.org/50414669169.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/15799548424.pdfIn PDF document text
    • http://bumawusuka.mypressonline.com/bawajibisewulavumeb.pdfIn PDF document text
    • http://kapimivibix.22web.org/handbook_of_adhesives_and_sealants.pdfIn PDF document text
    • https://cdn.sqhk.co/sesizame/ibjgHhf/switch_plus_smart_homes.pdfIn PDF document text
    • https://cdn.sqhk.co/xufaribo/gi8jgyn/55320961558.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f1b84c49-d803-4a6e-b6f9-4dc5ac6418c5/42434286351.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e64f73b4-a1fe-44cc-8041-c50a56ba9d3c/josezaworogawuma.pdfIn PDF document text
    • http://seduwivita.epizy.com/ratagawaj.pdfIn PDF document text
    • https://s3.amazonaws.com/jupoti/upsc_prelims_2016_answer_key_paper_2.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/siboni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4d522b-1876-4b57-8eed-5a96245a1aab/ladder_safety_training_video.pdfIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/35002956302.pdfIn PDF document text
    • http://wewadem.epizy.com/masada_caballo_de_troya_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f26bbe8-57ac-4ecb-9b9a-623628f14016/what_are_the_prerequisites_for_the_camping_merit_badge.pdfIn PDF document text
    • http://vefewubine.epizy.com/pride_and_prejudice_movie_mrs_bennet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f96ff36-99ce-4571-854a-62df33f8150a/mini_gps_tracker_device_price.pdfIn PDF document text
    • https://s3.amazonaws.com/zarelusipofox/lakababuvix.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001109e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109E 5660 bytes
SHA-256: 173c1beceabff3d872ddb333fec3a4ac717d04ed3f0b0f3b22a7208a290aa03c
font_01_sfnt_off000123ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CA 11148 bytes
SHA-256: 930febe93229ef9ab246fdc99a5e29a2d18bed1cc07ed10b92105b225c5e9e05
font_02_sfnt_off00014992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14992 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34